Initial import

1 files changed, 55 insertions, 0 deletions

diff --git a/include/linux/mbcache.h b/include/linux/mbcache.h
new file mode 100644
index 000000000..6a392e7a7
--- /dev/null
+++ b/include/linux/mbcache.h
@@ -0,0 +1,55 @@
+/*
+  File: linux/mbcache.h
+
+  (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
+*/
+struct mb_cache_entry {
+	struct list_head		e_lru_list;
+	struct mb_cache			*e_cache;
+	unsigned short			e_used;
+	unsigned short			e_queued;
+	atomic_t			e_refcnt;
+	struct block_device		*e_bdev;
+	sector_t			e_block;
+	struct hlist_bl_node		e_block_list;
+	struct {
+		struct hlist_bl_node	o_list;
+		unsigned int		o_key;
+	} e_index;
+	struct hlist_bl_head		*e_block_hash_p;
+	struct hlist_bl_head		*e_index_hash_p;
+};
+
+struct mb_cache {
+	struct list_head		c_cache_list;
+	const char			*c_name;
+	atomic_t			c_entry_count;
+	int				c_max_entries;
+	int				c_bucket_bits;
+	struct kmem_cache		*c_entry_cache;
+	struct hlist_bl_head		*c_block_hash;
+	struct hlist_bl_head		*c_index_hash;
+};
+
+/* Functions on caches */
+
+struct mb_cache *mb_cache_create(const char *, int);
+void mb_cache_shrink(struct block_device *);
+void mb_cache_destroy(struct mb_cache *);
+
+/* Functions on cache entries */
+
+struct mb_cache_entry *mb_cache_entry_alloc(struct mb_cache *, gfp_t);
+int mb_cache_entry_insert(struct mb_cache_entry *, struct block_device *,
+			  sector_t, unsigned int);
+void mb_cache_entry_release(struct mb_cache_entry *);
+void mb_cache_entry_free(struct mb_cache_entry *);
+struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *,
+					  struct block_device *,
+					  sector_t);
+struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache,
+						 struct block_device *, 
+						 unsigned int);
+struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache_entry *,
+						struct block_device *, 
+						unsigned int);